Fluid-operated tool



Jan. 28, 1930.

G. c. PEARsoN FLUID OPERATED TooL y mw f t/ ii" Patented Jan. 28, 1930 UNITED STATES PATENT oFr-vlcr:

GUSTAV C. PEABSON, OF DENVER, COLORADO, ASSIGNOB TO GARDNER-DENVER OOHIPANY, OF DENVER, COLORADO, A CORPORATION OF DELAWARE FLUID-OPERATED TOOL Aminata mea 0eme; so, ma. serial m. 316,064.

The object of the present` invention is to provide novel, practical and very compact rifle bar ratchet mechanism and distributing valve structure for a fluid operated tool.

In the accompanying drawings:

Figure 1 is a longitudinal sectional view through such a tool'aud in which the novel referred form of the said invention has en embodied.

Figures 2, 3 and 4 are cross sectional views respectively on the line 2 2, 3--3 and 4-4 of Figure 1.

Figures 5 and 6 are perspective views of the plug member.

Figure 7 is a rear elevation of the same.

In the embodiment disclosed, a cylinder member is employed, comprising a barrel 8 having a piston chamber 9, and having its rear end counterbored to provide a cell 10.

In the piston chamber is a reciprocatory piston 11 chambered, as shown at 12, and having in the rear end of said chamber a rifle nut 13.

In the cell 10 is fitted a plug member 14.

g5 This member has a central rearwardly opening chamber 15, the front wall of which is pierced by a centralopening 16. T he peripheral wall of the chamber 15 -is rovided .l with an external annular series o ratchet teeth 17. The plug member 14 is further provided with a rear external annular channel 18 and a front external annular channel 19, the latter being preferably wider than 4. the former. These channels are connected by longitudinal cutout portions 20 connecting their adjacent ends.

A rear head 21 abuts the rear end of the plug member 14 and is provided with a supply passageway 22'having a port 23 opening into an annular groove 24. In the inner face of the head 21 communicating with this groove 24 are ports25 that open into the rear channel 18. It will thus be evident that motive fluid supplied through the pas- 4,5 sageway 22 will flow through the port 23 to vthe groove 24, thence by way ofthe ports 25,l tol the rear channel 18, and from said channel 18 through the cut-away portion 20,

to the groove 19. Distributing passageways 26 are formed in the front end of the lug no member 14 and o en from one end ofp the f' channel 19 throug the medium of a common ort 27. These passageways 26 thus y., open into the rear end of the piston chamber 9. Opening from the opposite end of the channel 19 is a distributing port 28 extending transversely through the plug 14 and having a branch 29. The port 28 and branch 29 are in communication with distributin assageways 30 formed in the barrel 8, and 60 eading to the front end of the piston chamber 9. The plug member 14 is provided with an outstanding pin 31 projecting into the central portion of the channel 19 and on this pin is pivotally mounted a rocking automatic distributing valve 32, arcuate 1n form and so arranged that its ends are adapted to alternately close the ports 27 and 28. This will be clear by reference to Figure 3.

As thus far described it will be evident that if there is motivefluid in the channel 19, and the valve is in a neutral position, the flow of fluid through one or the other of the ports 27-28 will cause the valve to swing to cover one of said ports, as shown for example in Figure 3, wherein the port 28 is covered and consequently the port 27 is open. Motive fluid will then flow through the passageways 26 into the rear end of the piston chamber 9 and drive the piston 9o forwardly, there being an exhaust port as 33 from the piston chamber 9 to atmosphere. When this is uncovered, upon the forward movement of the piston, motive fluid will flow more freely therefrom, and at the same g5 time fluid in advance of the piston will be compressed, and acting through the passageways 30 and port 28, will create pressure against one end of the valve over said port 28. The valve will therefore swing to its opposite position, opening said port 28 and closing the port 27. When this occurs motive fluid flows through the port 28, branch 29 and passageways 30, to the front end of the piston chamber, driving the piston rearwardly. As said piston reaches the rear end of its stroke, compression again acts through the passageways 26 and port 27 to return the valve to the position shown in Figure 3. The rear chamber 15 formed in the plug member 14 receives the ratchet head 34 of a riiie bar 35 that is rotatably mounted in the opening 16 and said rifle bar engages the nut 13 of the piston in a manner well understood. The head of the rifle bar is provided with suitable spring pressed pawls 36 that cooperate with the ratchet teeth 17 of the plug 14.

With this structure, it will be evident that the plug member 14 constitutes a rear end wall for the piston chamber, a valve casing and a support for the rile bar and its ratcheting mechanism. The parts are compactly related, are readily accessible and will effectively cooperate to perform their functions.

From the foregoing, it is though that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. In a Huid operated tool, the combination with a cylinder member having a piston chamber and a cell in rear of the piston chamber, of a piston in the piston chamber, a plug fitting the cell and having a valve chamber and a ratchet chamber, an automatic distributing valve in the valve chamber controlling the supply of motive Huid to the piston chamber, and a ril-le bar having ratchet mechanism in the ratchet chamber.

2. In a fluid operated tool, the combination with a cylinder member having a piston chamber and a cell in rear of the piston chamber, of a piston in the piston chamber, a plug fitting the cell and having a valve chamber and a second chamber provided with ratchet means on its peripheral Wall, an automatic distributing valve in the valve chamber controlling the supply of motive fluid to the piston chamber, and a rifle bar having ratchet mechanism in the second chamber coacting with the said ratchet means on the wall of said chamber.

3. In a fluid operated tool, the combination with a cylinder member having a piston chamber and a cell in rear ot the piston chamber, of a piston in the piston chamber, a plug in the cell having a rear chamber with internal ratchet teeth on its peripheral wall, said plug also having an annular external channel, a ritle bar for the piston having a ratchet head in the plug chamber and provided with a pawl coacting with the ratchet teeth, means for supplying motive fluid to the channel, distributing passageways leading from the channel to the piston chamber, and an automatic distributing valve in the channel conratchet head in the plug chamber and pro- 'l vided with a pawl coacting with the ratchet teeth, means for supplying motive Huid to 'the channel, distributing passageways leading from the channel to the piston chamber, and an automatic distributing valve in the channel controlling the distributing passagewa s.

53.7. In a fluid operated tool, the combination with a cylinder member having a piston chamber and a cell, in rear of the piston chamber, of a piston in the piston chamber, a plu in the cell, a rifie bar for the piston journale in the plug, and an automatic 'distributing vziilve mounted on and removable with the p (gIn a Huid operated tool, the combination with a cylinder member having a piston chamber and a cell in rear of the piston chamber, of a piston in the piston chamber, a plug in the cell having an external channel, a distributingl controlling rocker valve mounted in the channel, means for supplying motive fluid to the channel, and passageways from the channel to the piston chamber controlled by the rocker valve.

7. In a fluid operated tool, the combination with a cylinder member having a piston chamber and a cell in rear of the piston chamber, of a piston in the piston chamber, a plug in the cell having an external annular channel, a curved rocker valve mounted between its ends in the channel and transversely thereof, a motive fluid supply passageway leading to the channel, and distributing passageways leading to the piston chamber and havin their inlet ends under and alternately close by the ends of the valve.

8. In a luid operated tool, the combination with a cylinder member having a piston chamber and a cell in rear of the piston chamber, of a piston in the piston chamber, a plug in the cell having a rearwardly opening central chamber, the peripheral wall of which has ratchet teeth, a riHe bar engaged with lthe piston and havin a head in the chamber provided withA paw s coacting with the teeth, spaced front and rear annular channels in the periphery of the plug with points con- 5 necting the same, a supply passagewa lead DlscnAlMER 1,744,917.-G'ustav 0. Pearson, Denver, Colo. FLUID-OPILRATED TOOL. Patent -dated January 28, 1930. Disclaimer led' May 24, 1932, by the assignee,

Gardner-Denver Company. l

Hereby enters this disclaimer to claims 1 and 2 of said patent which is in the following Words, to Wit:

1. In a fluid operated tool, the combination with a cylinder member having a piston chamber and a cell in rear of the piston chamber, of a piston in the piston chamber, a plug fitting the cell and having a valve chamber and a ratchet chamber,

i an automatic distributing valve in the valve chamber controlling the supply of motive fluid to the piston chamber, and a rifle bar having ratchet mechanism in the ratchet chamber.

2. In a fluid operated tool, the combination with a cylinder member having a pis' ton chamber and a cell in rear of the piston chamber, of a piston in the piston chamber, a plug fitting the cell and having a valve chamber and a second chamber provided 'with ratchet means on its'peripheral Wall, an automatic distributing valve in the valve chamber controlling the supply of motive fluid to the piston chamber, and a rifle bar having ratchet mechanism in the second chamber coacting with the said ratchet means on the Wall of said chamberj [Oficial Gazette June 14,' 1932.] 

